Samsung LB15VS Service Manual page 25

5 Troubleshooting
5-1-11 V Deflection Failure
13V and –10V lines are on?
Yes
8
IC401 Pin 23 output exists?
Yes
9
IC301 Pin 6 output exists?
Yes
Check DY connector
connection.
5-1-12 V Size or Position Variation Failure
IC401 Pin 23 output varies
with different DAC values?
Yes
Check and replace IC301.
5-6
No
Refer to 5-1-1 no power
supply
No
Check and replace IC401.
No
Check and replace
components around IC301.
No
Check and replace IC201 and
IC401.
WAVEFORMS
8
2.5 Vpp (IC401, #23)
9
50 Vpp (IC301, #6)
LB15VS/LB17LS/LB17KS/
LB17LT/LB17KT